An extensive series of experiments have been conducted to investigate the effects of C₃H₆, SO₂, temperatures, and their combination on the comprehensive performance of the plasma-facilitated NH₃–SCR hybrid reactor (PFSHR) system. The addition of C₃H₆ drastically changes the pathway of NO oxidation in the process of dielectric barrier discharge (DBD), which can efficiently promote the oxidation of NO to NO₂, making it easier to achieve the fast SCR reaction and thus significantly improve the NO_x reduction at lower temperatures. In addition, the oxidation rate of NO to NO₂ is much higher than that of SO₂ to SO₃ due to the strong selective oxidation of DBD, which is one of the most important factors attributing to the robust resistance to SO₂ poisoning and the durability of the PFSHR system. Besides, SO₂ has some inhibiting effects on the activity of the PFSHR system at low temperatures below 250 °C, while the NO_x removal efficiency can be facilitated to a certain extent at medium to high temperatures. Moreover, the NO_x abatement efficiency of the PFSHR system is remarkably influenced by the SIED below 250 °C, and the change of NO_x reduction is relatively flat above 250 °C, which indicates that it is efficient for the DBD-assisted SCR to reduce NO_x at low temperatures. Additionally, the efficiency of NO oxidation to NO₂ and the C₃H₆ decomposition rate drops with the increase of the DBD reactor temperature, which, however, does not affect the NO_x reduction at high temperatures. Furthermore, some regulated byproducts, N₂O and CO, and unregulated byproducts, HCHO and CH₃CHO, generated in the PFSHR system, from which HCHO and CH₃CHO can efficiently participate in the SCR reactions and further enhance the NO_x removal efficiency, result in only a small amount of HCHO and CH₃CHO residue at the outlet of the PFSHR system.

中文翻译：

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C3H6、SO2 和温度对非热等离子体促进的 NH3-SCR 混合反应器系统以减少柴油发动机废气中 NOx 的影响


已经进行了一系列广泛的实验，以研究 C₃H₆、SO₂、温度及其组合对等离子体促进的 NH 3-SCR 混合反应器 （PFSHR） 系统综合性能的影响。C₃H₆ 的加入极大地改变了介电势垒放电 （DBD） 过程中 NO 氧化的途径，可以有效地促进 NO 氧化为 NO₂，使其更容易实现快速 SCR 反应，从而显着提高较低温度下的 NO_x 还原。此外，由于 DBD 具有很强的选择性氧化作用，NO 到 NO₂ 的氧化速率远高于 SO₂ 到 SO₃，这是归因于 PFSHR 系统对 SO₂ 中毒的强大抵抗力和耐用性的最重要因素之一。此外，SO₂ 在 250 °C 以下的低温下对 PFSHR 体系的活性有一定的抑制作用，而在中高温下可在一定程度上促进 NO_x 的去除效率。此外，PFSHR 系统的 NO_x 减排效率在 250 °C 以下受 SIED 影响显著，并且在 250 °C 以上 NO_x 减少的变化相对平坦，这表明 DBD 辅助 SCR 在低温下降低 NO_x 是有效的。 此外，NO 氧化为 NO₂ 和 C₃H₆ 分解速率的速率随着 DBD 反应器温度的升高而下降，但不影响高温下 NO_x 的还原。此外，PFSHR 系统中会产生一些受管制的副产物 N₂O 和 CO，以及不受管制的副产物 HCHO 和 CH₃CHO，HCHO 和 CH₃CHO 可以从中有效地参与 SCR 反应并进一步提高 NO_x 去除效率，导致 PFSHR 系统出口处仅残留少量 HCHO 和 CH₃CHO。